I have an old Eimac 4W300, which to the best of my knowledge is a water cooled 4X150A.It is really a nice looking job, just wish it was a heavier tube! WA5THJ -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com